Maybe not but then again a victory over maddalone today wouldn't be seen as a victory over a top 5 heavyweight.
Top 5: Willard - On film Fulton - Was filmed, not known to exist today Miske - Not sure if it was filmed. Gibbons - On film Firpo - On film.
I agree with you I just like to rank fighters relative to their era within that eras context so whilst allowing for the anomalous consideration of victories over great fighters on an equal playing ground. So for me a victory over firpo then means more than a victory over maddalone now. That might well point to a weak era but that is supposition, what isn't is that firpo was a major heavyweight contender whilst maddalone was a gate keeper.